LIST 



PLATES OF THE CRUSTACEA, 



PLATE 1. 



Fio. 



1 Platyonichus ocellatus. 



PLATE 2. 



2 Platycarcinus irroratus. 



PLATE 3. 



3 Lupa dicantha. 



PLATE 4. 



4 Libinia canaliculata. 



PLATE 5. 



5 Carcinus mcenas. 



6 — — 



7 Platyonichus ocellatus. 



PLATE 6. 



8 Lupa pelagica. 



9 Gelasimus vocans. 



10 — — 



1 1 Lithodes arctica. 



12 Oniscus asellus. 



13 Ligia oceanica. 



1 4 Cyamus ceti. 



PLATE 7. 

 Fio. 



14 Hyas coarctata. 



15 Pilumnus harrisi. 



16 Pinnotheres ostreum. 



17 Hippa talpoida. 



18 Pandalus annuliformis. 



19 Orchestia gryllus. 



20 Mysis spinulosus. 



PLATE 8. 



21 Pagurus pollicaris. 



22 — longicarpus. 



23 Gonodactylus setimanus. 



24 Crangon septemspinosus. 



25 Astacus bartoni. 



PLATE 9. 



26 Panopeus herbsti. 



27 Talitrus quadrifidus. 



28 Orchestia longicornis. 



29 Gammarus minus. 



30 Palemon vulgaris. 



31 Hypolite aculeatus. 



32 Asellus vulgaris. 



33 Limnoria terebrans. 



Fig. 



34 Anthura gracilis. 



35 Idotea tricuspis; 



36 Branchipus stagnalis. 



PLATE 10. 



37 Fluvicola herricki. 



38 (Underside magnified.) 



39 (Upperside ditto.) 



40 Cymothoa triloba. 



4 1 — olivacea. 



42 Stenosoma irrorata. 



43 Cerapus tubularis. 



44 Cecrops latreillii. 



45 Argulus alosae. 



46 Caligus americanus(male) 



47 — — female. 



48 Cypris hispida. 



49 ( Valves of the same. ) 



PLATE 11. 



50 Polyphemus occidentals. 



PLATE 12. 



51 Homarus americanus. 



52 (Lateral view of the beak.) 



